Release 0.55

Refs simonw#1205, simonw#1207, simonw#1214, simonw#1221, simonw#1226, simonw#1227, simonw#1232, simonw#1235

Release 0.54.1

Refs simonw#1214

Removed a rogue full-stop

Better tool for extracting issue numbers

Release 0.53

Refs simonw#1132, simonw#1135, simonw#1133, simonw#1138, simonw#1137

Release 0.52.5

Refs simonw#1134

Typo fix in release notes

Release 0.52.3

Refs simonw#1124

Release 0.52.2

Refs simonw#1116, simonw#1115, simonw#1100, simonw#749, simonw#1121

Release 0.52.1

Refs simonw#1098, simonw#1102, simonw#1114